Qt/Mapping: Fix "Default" not working properly.

Source/Core/DolphinQt2/Config/Mapping/MappingWidget.cpp

@@ -24,6 +24,7 @@ MappingWidget::MappingWidget(MappingWindow* window) : m_parent(window)
 {
   connect(window, &MappingWindow::ClearFields, this, &MappingWidget::OnClearFields);
   connect(window, &MappingWindow::Update, this, &MappingWidget::Update);
+  connect(window, &MappingWindow::Save, this, &MappingWidget::SaveSettings);
 }
 
 MappingWindow* MappingWidget::GetParent() const

Source/Core/DolphinQt2/Config/Mapping/MappingWidget.h

@@ -24,7 +24,7 @@ namespace ControllerEmu
 class Control;
 class ControlGroup;
 class EmulatedController;
-}
+}  // namespace ControllerEmu
 
 namespace ciface
 {
@@ -32,7 +32,7 @@ namespace Core
 {
 class Device;
 }
-}
+}  // namespace ciface
 
 class MappingWidget : public QWidget
 {

Source/Core/DolphinQt2/Config/Mapping/MappingWindow.cpp

@@ -345,6 +345,7 @@ void MappingWindow::OnDefaultFieldsPressed()
   m_controller->LoadDefaults(g_controller_interface);
   m_controller->UpdateReferences(g_controller_interface);
   emit Update();
+  emit Save();
 }
 
 bool MappingWindow::IsIterativeInput() const

Source/Core/DolphinQt2/Config/Mapping/MappingWindow.h

@@ -56,6 +56,7 @@ public:
 signals:
   void Update();
   void ClearFields();
+  void Save();
 
 private:
   void SetMappingType(Type type);